1. Having very keen vision
   "quick-sighted as a cat"
   - argus-eyed, hawk-eyed, keen-sighted, lynx-eyed, sharp-eyed, sharp-sighted 
2. Keenly perceptive or alert
   "quick-sighted into the faults of the time"
   - sharp-sighted, sharp-eyed

See also: perceptive, sighted

• sociolinguistically
• sociolinguistics
• sociological
• sociologically
• sociologist
• sociology
• sociology department
• sociometry
• sociopath
• sociopathic
• sociopathic personality
• sociopolitical
• sock
• sock away
• sockdolager
• socket
• socket wrench
• sockeye
• sockeye salmon
• socle
• Socotra begonia
• Socrates
• Socratic
• Socratic irony
• Socratic method